Inputting at a very slow velocity

Hi,

I am trying to build a sandpile forming in a rectangular box, that replicates a set of experiments I want to run. In the experiments, I want an input speed of 1 sand grain per second, and I am trying to replicate this in my model, however my model is currently inputs particles at a very high, constant rate

Is there a way of setting a input rate of particles into the model, where I can say I want X number of particles into the model in X time?

Box1forum.mfx (22.9 KB)

The solids volume fraction bc_ep_s is used to calculate the mass flow rate of the particles along with the velocity and inlet area you specifcy. Reduce this to a much lower value to tune your sand flow.

Alternatively you can use the bc_massflow_s keyword to directly specify the mass flow and let the code calculate the velocity (again using bc_ep_s).